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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<span class="sourceLineNo">003</span> * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<span class="sourceLineNo">004</span> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<span class="sourceLineNo">005</span> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<span class="sourceLineNo">006</span> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<span class="sourceLineNo">007</span> * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<span class="sourceLineNo">012</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<span class="sourceLineNo">014</span> * See the License for the specific language governing permissions and<a name="line.14"></a>
<span class="sourceLineNo">015</span> * limitations under the License.<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>package org.apache.commons.codec.binary;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.nio.charset.Charset;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.apache.commons.codec.BinaryDecoder;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.apache.commons.codec.BinaryEncoder;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.apache.commons.codec.CharEncoding;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.commons.codec.Charsets;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.commons.codec.DecoderException;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.commons.codec.EncoderException;<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>/**<a name="line.29"></a>
<span class="sourceLineNo">030</span> * Converts hexadecimal Strings. The charset used for certain operation can be set, the default is set in<a name="line.30"></a>
<span class="sourceLineNo">031</span> * {@link #DEFAULT_CHARSET_NAME}<a name="line.31"></a>
<span class="sourceLineNo">032</span> *<a name="line.32"></a>
<span class="sourceLineNo">033</span> * This class is thread-safe.<a name="line.33"></a>
<span class="sourceLineNo">034</span> *<a name="line.34"></a>
<span class="sourceLineNo">035</span> * @since 1.1<a name="line.35"></a>
<span class="sourceLineNo">036</span> * @version $Id: Hex.java 1619948 2014-08-22 22:53:55Z ggregory $<a name="line.36"></a>
<span class="sourceLineNo">037</span> */<a name="line.37"></a>
<span class="sourceLineNo">038</span>public class Hex implements BinaryEncoder, BinaryDecoder {<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>    /**<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * Default charset name is {@link Charsets#UTF_8}<a name="line.41"></a>
<span class="sourceLineNo">042</span>     *<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * @since 1.7<a name="line.43"></a>
<span class="sourceLineNo">044</span>     */<a name="line.44"></a>
<span class="sourceLineNo">045</span>    public static final Charset DEFAULT_CHARSET = Charsets.UTF_8;<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span>    /**<a name="line.47"></a>
<span class="sourceLineNo">048</span>     * Default charset name is {@link CharEncoding#UTF_8}<a name="line.48"></a>
<span class="sourceLineNo">049</span>     *<a name="line.49"></a>
<span class="sourceLineNo">050</span>     * @since 1.4<a name="line.50"></a>
<span class="sourceLineNo">051</span>     */<a name="line.51"></a>
<span class="sourceLineNo">052</span>    public static final String DEFAULT_CHARSET_NAME = CharEncoding.UTF_8;<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>    /**<a name="line.54"></a>
<span class="sourceLineNo">055</span>     * Used to build output as Hex<a name="line.55"></a>
<span class="sourceLineNo">056</span>     */<a name="line.56"></a>
<span class="sourceLineNo">057</span>    private static final char[] DIGITS_LOWER =<a name="line.57"></a>
<span class="sourceLineNo">058</span>        {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span>    /**<a name="line.60"></a>
<span class="sourceLineNo">061</span>     * Used to build output as Hex<a name="line.61"></a>
<span class="sourceLineNo">062</span>     */<a name="line.62"></a>
<span class="sourceLineNo">063</span>    private static final char[] DIGITS_UPPER =<a name="line.63"></a>
<span class="sourceLineNo">064</span>        {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>    /**<a name="line.66"></a>
<span class="sourceLineNo">067</span>     * Converts an array of characters representing hexadecimal values into an array of bytes of those same values. The<a name="line.67"></a>
<span class="sourceLineNo">068</span>     * returned array will be half the length of the passed array, as it takes two characters to represent any given<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * byte. An exception is thrown if the passed char array has an odd number of elements.<a name="line.69"></a>
<span class="sourceLineNo">070</span>     *<a name="line.70"></a>
<span class="sourceLineNo">071</span>     * @param data<a name="line.71"></a>
<span class="sourceLineNo">072</span>     *            An array of characters containing hexadecimal digits<a name="line.72"></a>
<span class="sourceLineNo">073</span>     * @return A byte array containing binary data decoded from the supplied char array.<a name="line.73"></a>
<span class="sourceLineNo">074</span>     * @throws DecoderException<a name="line.74"></a>
<span class="sourceLineNo">075</span>     *             Thrown if an odd number or illegal of characters is supplied<a name="line.75"></a>
<span class="sourceLineNo">076</span>     */<a name="line.76"></a>
<span class="sourceLineNo">077</span>    public static byte[] decodeHex(final char[] data) throws DecoderException {<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>        final int len = data.length;<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>        if ((len &amp; 0x01) != 0) {<a name="line.81"></a>
<span class="sourceLineNo">082</span>            throw new DecoderException("Odd number of characters.");<a name="line.82"></a>
<span class="sourceLineNo">083</span>        }<a name="line.83"></a>
<span class="sourceLineNo">084</span><a name="line.84"></a>
<span class="sourceLineNo">085</span>        final byte[] out = new byte[len &gt;&gt; 1];<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span>        // two characters form the hex value.<a name="line.87"></a>
<span class="sourceLineNo">088</span>        for (int i = 0, j = 0; j &lt; len; i++) {<a name="line.88"></a>
<span class="sourceLineNo">089</span>            int f = toDigit(data[j], j) &lt;&lt; 4;<a name="line.89"></a>
<span class="sourceLineNo">090</span>            j++;<a name="line.90"></a>
<span class="sourceLineNo">091</span>            f = f | toDigit(data[j], j);<a name="line.91"></a>
<span class="sourceLineNo">092</span>            j++;<a name="line.92"></a>
<span class="sourceLineNo">093</span>            out[i] = (byte) (f &amp; 0xFF);<a name="line.93"></a>
<span class="sourceLineNo">094</span>        }<a name="line.94"></a>
<span class="sourceLineNo">095</span><a name="line.95"></a>
<span class="sourceLineNo">096</span>        return out;<a name="line.96"></a>
<span class="sourceLineNo">097</span>    }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span>    /**<a name="line.99"></a>
<span class="sourceLineNo">100</span>     * Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.<a name="line.100"></a>
<span class="sourceLineNo">101</span>     * The returned array will be double the length of the passed array, as it takes two characters to represent any<a name="line.101"></a>
<span class="sourceLineNo">102</span>     * given byte.<a name="line.102"></a>
<span class="sourceLineNo">103</span>     *<a name="line.103"></a>
<span class="sourceLineNo">104</span>     * @param data<a name="line.104"></a>
<span class="sourceLineNo">105</span>     *            a byte[] to convert to Hex characters<a name="line.105"></a>
<span class="sourceLineNo">106</span>     * @return A char[] containing hexadecimal characters<a name="line.106"></a>
<span class="sourceLineNo">107</span>     */<a name="line.107"></a>
<span class="sourceLineNo">108</span>    public static char[] encodeHex(final byte[] data) {<a name="line.108"></a>
<span class="sourceLineNo">109</span>        return encodeHex(data, true);<a name="line.109"></a>
<span class="sourceLineNo">110</span>    }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span>    /**<a name="line.112"></a>
<span class="sourceLineNo">113</span>     * Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.<a name="line.113"></a>
<span class="sourceLineNo">114</span>     * The returned array will be double the length of the passed array, as it takes two characters to represent any<a name="line.114"></a>
<span class="sourceLineNo">115</span>     * given byte.<a name="line.115"></a>
<span class="sourceLineNo">116</span>     *<a name="line.116"></a>
<span class="sourceLineNo">117</span>     * @param data<a name="line.117"></a>
<span class="sourceLineNo">118</span>     *            a byte[] to convert to Hex characters<a name="line.118"></a>
<span class="sourceLineNo">119</span>     * @param toLowerCase<a name="line.119"></a>
<span class="sourceLineNo">120</span>     *            &lt;code&gt;true&lt;/code&gt; converts to lowercase, &lt;code&gt;false&lt;/code&gt; to uppercase<a name="line.120"></a>
<span class="sourceLineNo">121</span>     * @return A char[] containing hexadecimal characters<a name="line.121"></a>
<span class="sourceLineNo">122</span>     * @since 1.4<a name="line.122"></a>
<span class="sourceLineNo">123</span>     */<a name="line.123"></a>
<span class="sourceLineNo">124</span>    public static char[] encodeHex(final byte[] data, final boolean toLowerCase) {<a name="line.124"></a>
<span class="sourceLineNo">125</span>        return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);<a name="line.125"></a>
<span class="sourceLineNo">126</span>    }<a name="line.126"></a>
<span class="sourceLineNo">127</span><a name="line.127"></a>
<span class="sourceLineNo">128</span>    /**<a name="line.128"></a>
<span class="sourceLineNo">129</span>     * Converts an array of bytes into an array of characters representing the hexadecimal values of each byte in order.<a name="line.129"></a>
<span class="sourceLineNo">130</span>     * The returned array will be double the length of the passed array, as it takes two characters to represent any<a name="line.130"></a>
<span class="sourceLineNo">131</span>     * given byte.<a name="line.131"></a>
<span class="sourceLineNo">132</span>     *<a name="line.132"></a>
<span class="sourceLineNo">133</span>     * @param data<a name="line.133"></a>
<span class="sourceLineNo">134</span>     *            a byte[] to convert to Hex characters<a name="line.134"></a>
<span class="sourceLineNo">135</span>     * @param toDigits<a name="line.135"></a>
<span class="sourceLineNo">136</span>     *            the output alphabet<a name="line.136"></a>
<span class="sourceLineNo">137</span>     * @return A char[] containing hexadecimal characters<a name="line.137"></a>
<span class="sourceLineNo">138</span>     * @since 1.4<a name="line.138"></a>
<span class="sourceLineNo">139</span>     */<a name="line.139"></a>
<span class="sourceLineNo">140</span>    protected static char[] encodeHex(final byte[] data, final char[] toDigits) {<a name="line.140"></a>
<span class="sourceLineNo">141</span>        final int l = data.length;<a name="line.141"></a>
<span class="sourceLineNo">142</span>        final char[] out = new char[l &lt;&lt; 1];<a name="line.142"></a>
<span class="sourceLineNo">143</span>        // two characters form the hex value.<a name="line.143"></a>
<span class="sourceLineNo">144</span>        for (int i = 0, j = 0; i &lt; l; i++) {<a name="line.144"></a>
<span class="sourceLineNo">145</span>            out[j++] = toDigits[(0xF0 &amp; data[i]) &gt;&gt;&gt; 4];<a name="line.145"></a>
<span class="sourceLineNo">146</span>            out[j++] = toDigits[0x0F &amp; data[i]];<a name="line.146"></a>
<span class="sourceLineNo">147</span>        }<a name="line.147"></a>
<span class="sourceLineNo">148</span>        return out;<a name="line.148"></a>
<span class="sourceLineNo">149</span>    }<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>    /**<a name="line.151"></a>
<span class="sourceLineNo">152</span>     * Converts an array of bytes into a String representing the hexadecimal values of each byte in order. The returned<a name="line.152"></a>
<span class="sourceLineNo">153</span>     * String will be double the length of the passed array, as it takes two characters to represent any given byte.<a name="line.153"></a>
<span class="sourceLineNo">154</span>     *<a name="line.154"></a>
<span class="sourceLineNo">155</span>     * @param data<a name="line.155"></a>
<span class="sourceLineNo">156</span>     *            a byte[] to convert to Hex characters<a name="line.156"></a>
<span class="sourceLineNo">157</span>     * @return A String containing hexadecimal characters<a name="line.157"></a>
<span class="sourceLineNo">158</span>     * @since 1.4<a name="line.158"></a>
<span class="sourceLineNo">159</span>     */<a name="line.159"></a>
<span class="sourceLineNo">160</span>    public static String encodeHexString(final byte[] data) {<a name="line.160"></a>
<span class="sourceLineNo">161</span>        return new String(encodeHex(data));<a name="line.161"></a>
<span class="sourceLineNo">162</span>    }<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>    /**<a name="line.164"></a>
<span class="sourceLineNo">165</span>     * Converts a hexadecimal character to an integer.<a name="line.165"></a>
<span class="sourceLineNo">166</span>     *<a name="line.166"></a>
<span class="sourceLineNo">167</span>     * @param ch<a name="line.167"></a>
<span class="sourceLineNo">168</span>     *            A character to convert to an integer digit<a name="line.168"></a>
<span class="sourceLineNo">169</span>     * @param index<a name="line.169"></a>
<span class="sourceLineNo">170</span>     *            The index of the character in the source<a name="line.170"></a>
<span class="sourceLineNo">171</span>     * @return An integer<a name="line.171"></a>
<span class="sourceLineNo">172</span>     * @throws DecoderException<a name="line.172"></a>
<span class="sourceLineNo">173</span>     *             Thrown if ch is an illegal hex character<a name="line.173"></a>
<span class="sourceLineNo">174</span>     */<a name="line.174"></a>
<span class="sourceLineNo">175</span>    protected static int toDigit(final char ch, final int index) throws DecoderException {<a name="line.175"></a>
<span class="sourceLineNo">176</span>        final int digit = Character.digit(ch, 16);<a name="line.176"></a>
<span class="sourceLineNo">177</span>        if (digit == -1) {<a name="line.177"></a>
<span class="sourceLineNo">178</span>            throw new DecoderException("Illegal hexadecimal character " + ch + " at index " + index);<a name="line.178"></a>
<span class="sourceLineNo">179</span>        }<a name="line.179"></a>
<span class="sourceLineNo">180</span>        return digit;<a name="line.180"></a>
<span class="sourceLineNo">181</span>    }<a name="line.181"></a>
<span class="sourceLineNo">182</span><a name="line.182"></a>
<span class="sourceLineNo">183</span>    private final Charset charset;<a name="line.183"></a>
<span class="sourceLineNo">184</span><a name="line.184"></a>
<span class="sourceLineNo">185</span>    /**<a name="line.185"></a>
<span class="sourceLineNo">186</span>     * Creates a new codec with the default charset name {@link #DEFAULT_CHARSET}<a name="line.186"></a>
<span class="sourceLineNo">187</span>     */<a name="line.187"></a>
<span class="sourceLineNo">188</span>    public Hex() {<a name="line.188"></a>
<span class="sourceLineNo">189</span>        // use default encoding<a name="line.189"></a>
<span class="sourceLineNo">190</span>        this.charset = DEFAULT_CHARSET;<a name="line.190"></a>
<span class="sourceLineNo">191</span>    }<a name="line.191"></a>
<span class="sourceLineNo">192</span><a name="line.192"></a>
<span class="sourceLineNo">193</span>    /**<a name="line.193"></a>
<span class="sourceLineNo">194</span>     * Creates a new codec with the given Charset.<a name="line.194"></a>
<span class="sourceLineNo">195</span>     *<a name="line.195"></a>
<span class="sourceLineNo">196</span>     * @param charset<a name="line.196"></a>
<span class="sourceLineNo">197</span>     *            the charset.<a name="line.197"></a>
<span class="sourceLineNo">198</span>     * @since 1.7<a name="line.198"></a>
<span class="sourceLineNo">199</span>     */<a name="line.199"></a>
<span class="sourceLineNo">200</span>    public Hex(final Charset charset) {<a name="line.200"></a>
<span class="sourceLineNo">201</span>        this.charset = charset;<a name="line.201"></a>
<span class="sourceLineNo">202</span>    }<a name="line.202"></a>
<span class="sourceLineNo">203</span><a name="line.203"></a>
<span class="sourceLineNo">204</span>    /**<a name="line.204"></a>
<span class="sourceLineNo">205</span>     * Creates a new codec with the given charset name.<a name="line.205"></a>
<span class="sourceLineNo">206</span>     *<a name="line.206"></a>
<span class="sourceLineNo">207</span>     * @param charsetName<a name="line.207"></a>
<span class="sourceLineNo">208</span>     *            the charset name.<a name="line.208"></a>
<span class="sourceLineNo">209</span>     * @throws java.nio.charset.UnsupportedCharsetException<a name="line.209"></a>
<span class="sourceLineNo">210</span>     *             If the named charset is unavailable<a name="line.210"></a>
<span class="sourceLineNo">211</span>     * @since 1.4<a name="line.211"></a>
<span class="sourceLineNo">212</span>     * @since 1.7 throws UnsupportedCharsetException if the named charset is unavailable<a name="line.212"></a>
<span class="sourceLineNo">213</span>     */<a name="line.213"></a>
<span class="sourceLineNo">214</span>    public Hex(final String charsetName) {<a name="line.214"></a>
<span class="sourceLineNo">215</span>        this(Charset.forName(charsetName));<a name="line.215"></a>
<span class="sourceLineNo">216</span>    }<a name="line.216"></a>
<span class="sourceLineNo">217</span><a name="line.217"></a>
<span class="sourceLineNo">218</span>    /**<a name="line.218"></a>
<span class="sourceLineNo">219</span>     * Converts an array of character bytes representing hexadecimal values into an array of bytes of those same values.<a name="line.219"></a>
<span class="sourceLineNo">220</span>     * The returned array will be half the length of the passed array, as it takes two characters to represent any given<a name="line.220"></a>
<span class="sourceLineNo">221</span>     * byte. An exception is thrown if the passed char array has an odd number of elements.<a name="line.221"></a>
<span class="sourceLineNo">222</span>     *<a name="line.222"></a>
<span class="sourceLineNo">223</span>     * @param array<a name="line.223"></a>
<span class="sourceLineNo">224</span>     *            An array of character bytes containing hexadecimal digits<a name="line.224"></a>
<span class="sourceLineNo">225</span>     * @return A byte array containing binary data decoded from the supplied byte array (representing characters).<a name="line.225"></a>
<span class="sourceLineNo">226</span>     * @throws DecoderException<a name="line.226"></a>
<span class="sourceLineNo">227</span>     *             Thrown if an odd number of characters is supplied to this function<a name="line.227"></a>
<span class="sourceLineNo">228</span>     * @see #decodeHex(char[])<a name="line.228"></a>
<span class="sourceLineNo">229</span>     */<a name="line.229"></a>
<span class="sourceLineNo">230</span>    @Override<a name="line.230"></a>
<span class="sourceLineNo">231</span>    public byte[] decode(final byte[] array) throws DecoderException {<a name="line.231"></a>
<span class="sourceLineNo">232</span>        return decodeHex(new String(array, getCharset()).toCharArray());<a name="line.232"></a>
<span class="sourceLineNo">233</span>    }<a name="line.233"></a>
<span class="sourceLineNo">234</span><a name="line.234"></a>
<span class="sourceLineNo">235</span>    /**<a name="line.235"></a>
<span class="sourceLineNo">236</span>     * Converts a String or an array of character bytes representing hexadecimal values into an array of bytes of those<a name="line.236"></a>
<span class="sourceLineNo">237</span>     * same values. The returned array will be half the length of the passed String or array, as it takes two characters<a name="line.237"></a>
<span class="sourceLineNo">238</span>     * to represent any given byte. An exception is thrown if the passed char array has an odd number of elements.<a name="line.238"></a>
<span class="sourceLineNo">239</span>     *<a name="line.239"></a>
<span class="sourceLineNo">240</span>     * @param object<a name="line.240"></a>
<span class="sourceLineNo">241</span>     *            A String or, an array of character bytes containing hexadecimal digits<a name="line.241"></a>
<span class="sourceLineNo">242</span>     * @return A byte array containing binary data decoded from the supplied byte array (representing characters).<a name="line.242"></a>
<span class="sourceLineNo">243</span>     * @throws DecoderException<a name="line.243"></a>
<span class="sourceLineNo">244</span>     *             Thrown if an odd number of characters is supplied to this function or the object is not a String or<a name="line.244"></a>
<span class="sourceLineNo">245</span>     *             char[]<a name="line.245"></a>
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<span class="sourceLineNo">308</span>     * @return the charset.<a name="line.308"></a>
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<span class="sourceLineNo">331</span>    public String toString() {<a name="line.331"></a>
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<span class="sourceLineNo">334</span>}<a name="line.334"></a>




























































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